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SAN JOSE, Calif. — Whipping out your smart phone to snap and post online pictures of yourself and your kids relaxing at home — or perhaps that pricey new TV you just hung on your rec room wall — is like throwing chum to a sea of hungry sharks.
That’s because smart-phone images can be deciphered to reveal precisely where the photos were taken, which security experts say could lead burglars and other criminals directly to your front door.
Similarly, they add, posting images from vacation sites or your workplace could invite crooks to ransack your house while you’re away.
“That can be sharing a bit too much,” said Con Mallon, senior director of mobility at security firm Symantec. “They can then put the location of where you are now and where your house is into a maps program and work out how much time they have to pay a visit while you’re out.”
Smart-phone photos are embedded with “geotags” containing the latitude and longitude. This data isn’t visible to the naked eye. But when deciphered with the help of photo-sharing Web sites, various apps, or other methods, those coordinates can enable someone using Google Maps to identify the precise spots depicted in the images.
That also makes the technology useful, for example, for someone with scads of photos who can’t otherwise remember where some of them were taken. And sharing geotagged photos online has become so commonplace, many people hardly give it a second thought.
“I’m OK with it,” said 25-year-old Roilo Escalada of Santa Clara, who is studying kinesiology at San Jose State and who occasionally posts pictures with his iPhone. “I don’t have any stalkers. I feel safe.”
Janisha McCoy, 30, who lives in Oakland and works at San Jose State, also was nonchalant.
“It’s not really that big of a concern when you think about all the other stuff that’s on the Internet,” she said. Still, several people interviewed on the campus were surprised to learn their pictures could reveal where they were snapped, and Ms. McCoy added, “It’s something to think about.”
Indeed, geotagged photos have posed unanticipated problems for even the most computer-savvy.
That includes Joh McAfee, founder of the anti-virus software company that bears his name. After eluding Belize authorities who were seeking to talk to him as a “person of interest” in the 2012 shooting death of his neighbor, McAfee’s location was revealed when a photo of his Guatemalan hideout was posted online.
Adam Savage, host of the TV science show MythBusters, was embarrassed a few years ago when he took a picture of his car in front of his house and posted it on Twitter, inadvertently disclosing to his fans where he lived.
Still another case involved Higinio Ochoa, a Texas man with ties to the hacking group Anonymous, who was convicted in 2012 of stealing data from law-enforcement computers. After he taunted authorities by posting a photo of his girlfriend, the FBI was able to track him down in part from the location revealed in the image.
Some Web commentators claim concerns about geotagged smart-phone photos are unwarranted, noting that millions routinely post them without being victimized. Nonetheless, the National White Collar Crime Center, a nonprofit organization that helps police combat economic and tech-related crimes, has cautioned that placing such pictures on the Internet can be dangerous.
The military is worried, too. The Army issued a warning about geotagged photos after some soldiers posted pictures of military helicopters landing at an Iraqi base in 2007. Using the photos’ location data, enemy attackers precisely targeted and destroyed four of the copters with mortar rounds.
In addition, the New York Times and Guardian newspapers recently reported that documents obtained from former NSA contractor Edward Snowden show U.S. and British spy authorities have the ability to view geotag data in photos uploaded to various social media sites.
Experts advise anyone nervous about others knowing where their photos are snapped to block their phone’s geotag features through the phone’s settings or with geotag-disabling apps available on the Internet.
“Is location sharing a bad idea? Yes and no,” said Tony Anscombe, senior security evangelist at AVG Technologies. “I take many pictures and post them on photo-sharing sites so that others can enjoy them.”
But he advises caution, because revealing where a person lives, works, or otherwise frequents creates “a risk that most would agree is not necessary.”
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